Subgenus Decaloba comprises ca. 235 species and is currently divided into eight supersections
(Feuillet & MacDougal 2003 [2004]), seven of which are found in the New World (224 species), while
the eighth supersection comprises all Old World members (21 species).

3. Stipules 0.5–16(–23) x 0.2–6(–15) mm,
setaceous, subulate, narrowly triangular, falcate, ovate, or obovate, if foliose or clasping
then one primary vein near one margin of the stipule, or a single prominent center vein not
obvious; floral bracts 3 and similar in size and form, or 2 and setaceous, or absent, when
present 1.3–18 x 0.2–15 mm, setaceous to foliose; stem glabrous or pubescent;
shoot apex straight.